The NaN guard was on one of two doors. A FUNPACK_SETTINGS socket is typed by
a string tag, so a dict reaches the load node without necessarily having
passed through the settings node -- a raw API prompt does exactly that.
Through that door, until_sigma = NaN made ALG a permanent no-op: sigma > nan
is False at every step, so the anchor was never loosened, and the node
reported "1 modifier applied: alg". Nothing about the run looked wrong,
which is the only reason this is worth a commit of its own.
Values are now checked against the declaration at the point they are
consumed. The producer still checks too; that is not redundant, it is where
a person editing JSON gets told immediately.
Also recorded ALG's standing assumption rather than leaving it implicit: the
anchor is latent frame 0. True of everything it can currently be wired into,
untrue in general, and the denoise_mask already carries what would be needed
to do it properly. Left undone because nothing yet pins elsewhere, and a
derivation with no consumer cannot be checked against reality.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
